neighbors.js

import * as Helpers from "../helpers";
import jQuery from "jquery";

export { NodeNeighborOverlay };

/**
 * Displays an overlay showing the neighbors of a node divided by the link type
 * that connects them.
 */
class NodeNeighborOverlay {
    constructor(graph, parentNode, infoOverlay, type = "link") {
        this.graph = graph;
        this.parentNode = parentNode;
        this.infoOverlay = infoOverlay;
        this.type = type;

        this.activeTabNav = null; // The currently selected tab handle
        this.activeTabContent = null; // The currently selected tab content

        this.tabContentPages = {};
        this.tabNavHandles = {};
    }

    /**
     * Creates the visible elements of the overlay.
     * Must be called after the graph has been initialized.
     */
    create() {
        const bottomContainerDiv = Helpers.createDiv(
            "bottom-container",
            this.parentNode
        );
        const coll = Helpers.createDiv(
            "button",
            bottomContainerDiv
        );
        coll.className = "collapsible";
        coll.innerText = "Verwandte Inhalte";
        var contentTabs = Helpers.createDiv(
            "neighbor-content-tabs",
            bottomContainerDiv
        );
        coll.style.display = "flex";
        coll.style.textDecoration = "underline black";
        this.contentTab = contentTabs;
        contentTabs.style.display = "flex";
        coll.addEventListener("click", function() {
            if(contentTabs.style.display === "flex") {
                contentTabs.style.display = "none";
            } else {
                contentTabs.style.display = "flex";
            }
        });
        const colors =
            this.type === "link"
                ? this.graph.edgeColors
                : this.graph.nodeColors;
        for (const [cls, color] of Object.entries(colors)) {


            const collTab = Helpers.createDiv(
                "button",
                contentTabs
            );
            collTab.className = "collapsible";
            collTab.innerText = cls;
            collTab.style.borderLeftColor = color;
            collTab.style.borderLeftWidth = "8px";
            collTab.type = cls;
            this.tabNavHandles[cls] = collTab;


            const collTabContent = Helpers.createDiv(
                "neighbor-content-links",
                contentTabs
            );
            collTabContent.type = cls;
            this.tabContentPages[cls] = collTabContent;
            collTab.addEventListener("click", function() {
                if(collTabContent.style.display === "flex") {
                    collTabContent.style.display = "none";
                } else {
                    collTabContent.style.display = "flex";
                }
            });
        }
    }

    /**
     * Clears the images from all tab content pages and makes the object
     * invisible.
     */
    clearTabContentPages() {
        for (const page of Object.values(this.tabContentPages)) {
            jQuery(page).empty();
            if(page.style.display === "flex") {
                page.style.display = "none";
            }
        }
    }

    /**
     * Creates a new image (with link) for the given target node.
     * @param target
     * @returns {HTMLDivElement}
     */
    createReference(target) {
        const linkDiv = document.createElement("div");
        var linkText = document.createTextNode("- " + target.name);
        linkDiv.appendChild(linkText);
        linkDiv.style.margin = "2px";
        linkDiv.style.cursor = "pointer";
        jQuery(linkDiv).on("click", () => {
            this.graph.focusOnNode(target);
            this.infoOverlay.updateInfoOverlay(target);
        });
        return linkDiv;
    }

    /**
     * Updates all tabs to have content matching the given node.
     * @param node
     */
    updateTabs(node) {
        this.clearTabContentPages();
        for (const link of node.links) {
            const target = link.source == node ? link.target : link.source;
            const reference = this.createReference(target);
            if (this.type === "link") {
                this.tabContentPages[link.type].appendChild(reference);
            } else {
                this.tabContentPages[target.type].appendChild(reference);
            }
        }
        this.hideContentPages();
    }

    /**
     * Hides all the categories of a node that are not represented by a link
     * to another neighbor.
     */
    hideContentPages () {
        for (const page of Object.values(this.tabContentPages)) {
            if(!page.hasChildNodes()) {
                this.tabNavHandles[page.type].style.display = "none";
            } else {
                this.tabNavHandles[page.type].style.display = "flex";
            }
        }
    }
}